A biflecnode, also called a biflecnodal point, is a point at which a curve crosses itself and is at the same time an inflection point. Biflecnodes are possible for curves of degree four and higher.
Biflecnode
See also
Inflection PointExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Biflecnode." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Biflecnode.html